WORCESTER — Julie A. Corey's lawyers called several witnesses to the stand Friday as they continued to attack the police investigation that led to Ms. Corey being charged with the 2009 murder of Darlene L. Haynes.

Worcester Detectives Michael Gingerelli and Lee Boykin were both asked a series of questions about a pair of blue booties and two cut pant legs from what appeared to be a pair of hospital pants that were recovered in a July 28, 2009, "trash pull" at 12 Ives St., where Ms. Haynes' ex-boyfriend, Roberto C. "Tito" Rodriguez, was then living.

Ms. Corey, 39, stands accused of beating and strangling the 23-year-old Ms. Haynes, cutting the baby she was carrying from her womb, and then trying to pass the newborn off as her own. The victim's body was found in a bedroom closet in her apartment at 94 Southgate St. on July 27, 2009.

Ms. Corey's defense team concedes that she was found two days later with Ms. Haynes' baby at a homeless shelter in Plymouth, N.H., but maintains she played no part in the slaying. They have criticized the police investigation as flawed, and have accused investigators of failing to follow up on leads that could have led them to the person or persons responsible for Ms. Haynes' death.

Asserting what is called "third party culprit" defense, they have been allowed by Judge Janet Kenton-Walker to introduce evidence in an attempt to show that someone other than Ms. Corey may have committed the crime or had the motive, intent or opportunity to do so.

Under questioning last week by defense lawyer Louis P. Aloise, Ms. Corey's former boyfriend, Alex Dion, denied the suggestion that Mr. Rodriguez gave the baby to him and Ms. Corey.

Detective Gingerelli was asked by defense lawyer Michael C. Wilcox Friday about what was done with the booties and cut pants legs that were found in the trash at the Ives Street address.

The detective said the standard procedure would have been to contact the crime scene unit or other detectives involved in the investigation to see if the items should be kept.

"I believe it was determined that they weren't items that we needed as part of our investigation," the detective said. When asked if the items were discarded, Detective Gingerelli said he could not recall. He testified that he was uncertain if they had been sent to the crime scene unit for testing, and said he did not know if photographs were taken of them.

When later asked by Mr. Aloise what became of the booties and cut pant legs, Detective Boykin said they would have been forwarded to the crime scene unit. Mr. Aloise asked if the detective ever saw a lab report detailing an analysis of the items. Detective Boykin said he did not.

Mr. Rodriguez was twice interviewed by police about Ms. Haynes' death. He denied any knowledge of the slaying and was not charged.

During the testimony of Detective John Doherty, a videotaped interview of William Daviau, who had once rented a spare bedroom from Ms. Haynes and Mr. Rodriguez at 94 Southgate St., was played for the jury. Mr. Daviau, who died in 2010, told investigators he moved out of 94 Southgate St. on July 5, 2009, and went into detoxification at Community Healthlink because of a heroin addiction.

He said he later spent about two weeks at the Catholic Worker House on Mason Street and never returned to the Southgate Street address before Ms. Haynes' body was found.

When told that a neighbor of Ms. Haynes reported seeing a man fitting his description having a cigarette with Ms. Haynes and Ms. Corey on the back porch at 94 Southgate St. on the night of July 23, 2009, Mr. Daviau responded, "There's no way."

Later in the interview, Mr. Daviau told the detectives he had no involvement in the slaying and did not know who might have committed the crime.

Under questioning by Mr. Wilcox, Detective Doherty said he never went to the Catholic Worker House to confirm that Mr. Daviau had been staying there.

Also testifying Friday was Brianna Bushey, a 25-year-old former girlfriend of Mr. Rodriguez, who told the jury that Mr. Rodriguez assaulted her in a jealous rage in 2006. Ms. Bushey said the assault occurred in a self-service laundry on Mill Street, where Mr. Rodriguez was working.

Angry because he believed she had been talking to a former boyfriend, Mr. Rodriguez dragged her to the back of the laundry, put a bathrobe belt around her neck and began to choke her, telling her, "It would only hurt for a minute," Ms. Bushey said.

She testified that Mr. Rodriguez told her he was going to hang her and put a knife to her throat, causing her to plead for her life. Ms. Bushey said she managed to escape when the telephone rang and Mr. Rodriguez went to answer it. She said she encountered a passer-by on the street and asked him to call 911.

Police arrived and Mr. Rodriguez was arrested, she said. Ms. Bushey said she did not pursue the matter in court because she was afraid of Mr. Rodriguez, but did obtain a restraining order against him. The charges were eventually dismissed.

Ms. Haynes also obtained a restraining order against Mr. Rodriguez, which was in effect at the time of her death. She had accused him of assaulting her about a month before her death. Those charges were dropped after Ms. Haynes was killed.

When he was questioned by police after the discovery of Ms. Haynes' body, Mr. Rodriguez told police that both women's allegations were false.

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